#
# gPrime - A web-based genealogy program
#
# Copyright (C) 2002-2006  Donald N. Allingham
# Copyright (C) 2016       Nick Hall
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#

"""
Rule that checks for a family that is an ancestor of a specified family.
"""

#-------------------------------------------------------------------------
#
# Gprime modules
#
#-------------------------------------------------------------------------
from .. import Rule
from ....const import LOCALE as glocale
_ = glocale.translation.gettext

#-------------------------------------------------------------------------
#
# IsAncestorOf
#
#-------------------------------------------------------------------------
class IsAncestorOf(Rule):
    """
    Rule that checks for a family that is an ancestor of a specified family.
    """
    labels = [_('ID:'), _('Inclusive:')]
    name = _('Ancestor families of <family>')
    category = _('General filters')
    description = _('Matches ancestor families of the specified family')

    def prepare(self, db):
        self.map = set()
        first = False if int(self.list[1]) else True
        root_family = db.get_family_from_gid(self.list[0])
        self.init_list(db, root_family, first)

    def reset(self):
        self.map.clear()

    def apply(self, db, family):
        return family.handle in self.map

    def init_list(self, db, family, first):
        """
        Initialise family handle list.
        """
        if not family:
            return
        if family.handle in self.map:
            return
        if not first:
            self.map.add(family.handle)

        for parent_handle in [family.get_father_handle(),
                              family.get_mother_handle()]:
            if parent_handle:
                parent = db.get_person_from_handle(parent_handle)
                family_handle = parent.get_main_parents_family_handle()
                if family_handle:
                    parent_family = db.get_family_from_handle(family_handle)
                    self.init_list(db, parent_family, 0)
